从Docker容器获取环境变量 [英] Get Environment Variable from Docker Container

问题描述

$ p

通过一些 docker exec container / bin / bash 会话设置的环境变量

我可以做 docker exec container env | grep ENV_VAR ，但我更喜欢只返回值的东西。

我尝试使用 docker exec container echo$ ENV_VAR，但替换似乎发生在容器外面，所以我没有从容器中获取env var，而是从我自己的电脑获取env var。

谢谢。

解决方案

运行在容器中回显$ ENV_VAR，以便在容器中发生变量替换：

  docker exec container bash -c'echo$ ENV_VAR'
  

What's the simplest way to get an environment variable from a docker container that has not been declared in the Dockerfile?

For instance, an environment variable that has been set through some docker exec container /bin/bash session?

I can do docker exec container env | grep ENV_VAR, but I would prefer something that just returns the value.

I've tried using docker exec container echo "$ENV_VAR", but the substitution seems to happen outside of the container, so I don't get the env var from the container, but rather the env var from my own computer.

Thanks.

解决方案

The proper way to run echo "$ENV_VAR" inside the container so that the variable substitution happens in the container is:

docker exec container bash -c 'echo "$ENV_VAR"'

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